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Ramp signal generator and CMOS image sensor using the same

a signal generator and image sensor technology, applied in the field of image sensors, can solve the problems of large size of feedback capacitor and occupying a lot of chip area, and achieve the effects of less power, less chip area, and reduced feedback capacitor siz

Active Publication Date: 2017-06-13
SK HYNIX INC
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method to reduce the size of a feedback capacitor and create an integrator type ramp signal generator that is more power-efficient and takes less chip area. Additionally, this invention is suitable for a single slope analog-to-digital converter of a CMOS image sensor.

Problems solved by technology

However, the conventional integrator type ramp signal generator has a problem in that the size of the feedback capacitor is large and occupies a lot of chip area.

Method used

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  • Ramp signal generator and CMOS image sensor using the same
  • Ramp signal generator and CMOS image sensor using the same
  • Ramp signal generator and CMOS image sensor using the same

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Embodiment Construction

[0040]Various embodiments will be described below in more detail with reference to the accompanying drawings. The present invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. Throughout the disclosure, like reference numerals refer to like parts throughout the various figures and embodiments of the present invention.

[0041]The drawings are not necessarily to scale and, in some instances, proportions may have been exaggerated to clearly illustrate features of the embodiments. It is also noted that in this specification, “connected / coupled” refers to one component not only directly coupling another component, but also indirectly coupling another component through an intermediate component. In addition, a singular form may include a ...

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Abstract

Disclosed are a ramp signal generator capable of reducing the size of a feedback capacitor by using a current subtraction and a CMOS image sensor using the same. The ramp signal generator may include a current supply unit suitable for supplying a first current; a current subtraction unit suitable for subtracting the first current from a second current, or the second current from the first current; and a ramp signal generation unit suitable for generating a ramp signal according to a third current and a reference voltage. The third current is a result of the subtraction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority of Korean Patent Application No. 10-2015-0057680, filed on Apr. 24, 2015, which is incorporated herein by reference in its entirety.BACKGROUND[0002]1. Field[0003]Exemplary embodiments of the present invention relate to an image sensor (IS), and more particularly, to an integrator type ramp signal generator suitable for a single slope analog-to-digital converter (ADC) and a complementary metal oxide semiconductor (CMOS) IS using the same.[0004]2. Description of the Related Art[0005]Single slope ADCs (S-ADC) are generally used in CMOS ISs (CISs) and CIS products. As CISs continue the trend toward higher frame rates and are implemented in various ways, the specifications required for the market become stricter.[0006]In one example, when a ramp signal generator is realized using a current steering digital-to-analog converter (DAC) in the CIS using the S-ADC, it is necessary to adjust the current to adju...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04N5/378H04N5/3745H03K4/56
CPCH04N5/378H03K4/56H04N5/3745H04N25/77H04N25/78H04N25/75
Inventor SOHN, YOUNG-CHUL
Owner SK HYNIX INC
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